Three Creek, Idaho - 7.5 Minute Series Topo Map Sweden These aerial photographs will be

These aerial photographs will be useful for professionals in­volved with geologic

Katherine Landing

and minerals hidden throughout the Southwest

and mud were shed from the west creating thick deposits of marine sandstone

it serves as an effective visual tool to represent elevation changes

Three Creek, Idaho - 7.5 Minute Series Topo Map Sweden These aerial photographs will beThe distinctive characteristic of a topographic map is that the shape of the Earth's surface is shown by contour lines. Contours are imaginary lines that join points of equal elevation on the surface of the land above or below a reference surface, such as mean sea level. Contours make it possible to measure the height of mountains, depths of the ocean bottom, and steepness of slopes. A topographic map shows more than contours. The map also includes